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Firefox and the Chrome engine are open source projects. Anyone can modify the browser to enable ad-blocking in some form if a user is sufficiently determined.
Technically, sure. But, these are extremely complex software products, and it would be one hobbyist vs. an entire software division of a trillion dollar company who are determined to make sure you see ads.
Terrorist / Terrorism seems to be a magic word in US law and policy.
If a country has organized crime in their country it’s no big deal. If there are close ties between the rulers and the criminals, that’s unfortunate.
But, if the criminals are now labelled as terrorists, then you get to go on the state sponsors of terrorism list, which comes with all kinds of sanctions and restrictions.
If you look at so-called “terrorist” organizations, there’s almost always elements of “terrorist” activities, but also evidence of other random criminal activities, and often legitimate political activities too. Take Sinn Fein, the political arm of the IRA. Some of their funding came from fuel and drug smuggling. So, where you draw the line between a “terrorist” group and a criminal group is pretty arbitrary. I think most people would say that the Mexican cartels are primarily criminals though. While they do kill people in ways that are intended to send a message, the message is generally “don’t mess with our profits” rather than some political ideal.
Every country has some corruption, definitely including the US. So, what happens if a Mexican politician was accepting bribes from Narcos and passing legislation favourable to them? When does that become the state sponsoring terrorism?
Putting the “terrorist” label on Mexican cartels seems like a prelude to doing things that violate Mexico’s sovereignty. If the cartels are merely violent criminal organizations, it’s a problem for Mexico’s government. If they’re “terrorists” then the US can lob missiles into Mexico, because it has a long-standing policy of violating the sovereignty of countries that “harbor” (i.e. contain) terrorists.